There are a few ways to block bad websites on Android. The first way is to use a browser extension. There are many of these available, and you can find the best one for your device here. Another way is to use a VPN service. A VPN encrypts your traffic and makes it difficult for bad websites to track you. Finally, you can try using an ad blocker service like AdBlock Plus or NoScript. These services will stop ads from being displayed on bad websites, which will help you stay safe online.